CVE-2021-26257

Denial of service via improper buffer restrictions

Published Aug 18, 2022 · Updated May 5, 2025

Improper buffer restrictions in Intel Wireless Bluetooth and Killer Bluetooth firmware before 22.120 allow local users to cause denial of service. Intel has not disclosed the affected firmware routine, the attacker-controlled input, or the buffer operation that exceeds its bounds. Exploitation requires local low-privileged access and interaction by another user; the advisory does not specify whether the interruption affects the adapter, Bluetooth stack, or host.

CVSS severity5.6
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper buffer restrictions in Intel Wireless Bluetooth and Killer Bluetooth firmware before 22.120 allow local users to cause denial of service. Intel has not disclosed the affected firmware routine, the attacker-controlled input, or the buffer operation that exceeds its bounds. Exploitation requires local low-privileged access and interaction by another user; the advisory does not specify whether the interruption affects the adapter, Bluetooth stack, or host.

The record

CVE
CVE-2021-26257
Published
Aug 18, 2022
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2022CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.6Intel CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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